This section is under construction. ====== NPR ====== NPR (New Packet Radio) is a custom radio protocol, designed to transport bidirectional IP trafic over 430MHz radio links (ham radio frequencies 420-450MHz). This protocol is optimized for "point to multipoint" topology, with the help of managed-TDMA. Bitrate is 50 to 500kbps (net, effective bitrate), depending on the RF bandwidth chosen. --[[https://hackaday.io/project/164092-npr-new-packet-radio |Hackaday Project Page]] This is interesting because NPR could be used to link to AREDN and provide slower links to areas where microwave is not an option. ===== What To Buy ===== * [[https://elekitsorparts.com/product/npr-70-modem-by-f4hdk-new-packet-radio-over-70cm-band-amateur-radio-packet-radio/ |NPR unit]] * [[https://elekitsorparts.com/product/vhf-uhf-rf-power-amplifier-for-dmr-handheld-radio-amplifier-ham-radio/ |Amplifier]] ((Make sure to read pages 12--14 of the {{https://cdn.hackaday.io/files/1640927020512128/NPR_advanced_guide_v2.16.pdf |advanced guide}} because some modifications to the amplifier are required.)) ===== More Info ===== Here are a few more links: * [[https://hackaday.io/project/164092-npr-new-packet-radio |Hackaday project page]] * [[https://www.arednmesh.org/content/new-packet-radio |Discussion on arednmesh.org]] * [[https://groups.io/g/New-Packet-Radio/topics |Official Groups.io]] * [[https://spectrum.ieee.org/build-a-longdistance-data-network-using-ham-radio |Article on IEEE Spectrum]] * [[https://www.dxzone.com/npr-new-packet-radio-ip-over-70-cm-band/ |Article on DX Zone]] * [[https://groups.io/g/Mid-Island-AREDN-Mesh-Network/topic/new_packet_radio_npr/86643045 |Our Groups.io thread]]